Key Takeaways

  • New Jersey is a Medigap Birthday Rule state - policyholders can change plans during their birthday month
  • New Jersey requires a 6-month open enrollment period for Medicare Supplement starting at age 65
  • Guaranteed issue rights apply when losing other coverage or during open enrollment
  • New Jersey prohibits pre-existing condition waiting periods during open enrollment
  • Medicare Supplement plans must be standardized (Plans A through N)
Last updated: January 2026

New Jersey Medicare Supplement (Medigap) Regulations

New Jersey has adopted special protections for Medicare beneficiaries purchasing Medicare Supplement (Medigap) insurance, including the "Birthday Rule."

The Birthday Rule

New Jersey is one of only a few states with a Birthday Rule for Medigap:

How It Works

  • During your birthday month (30-day period around your birthday)
  • You can switch to any Medigap plan
  • From any insurance company
  • Without health underwriting
  • Cannot be denied or charged more due to health conditions

Rules and Limitations

RuleRequirement
TimingYour birth month (30-day window)
Plan OptionsSame or lesser benefits only
PremiumBased on age, not health
InsurerCan switch companies
FrequencyOnce per year

Exam Tip: The Birthday Rule is New Jersey-specific and frequently tested. Remember: same or lesser coverage, during birthday month, no health underwriting.

Example

If your birthday is March 15:

  • Birthday month window applies
  • Can switch from Plan F to Plan G, N, or any plan with same or lesser benefits
  • Cannot switch to a plan with MORE benefits
  • New premium based on attained age, not health

Open Enrollment Period

New Jersey provides a 6-month open enrollment period for Medicare Supplement:

When It Begins

The 6-month period starts:

  • First day of the month you are 65 or older AND
  • Enrolled in Medicare Part B

Protections During Open Enrollment

  • Guaranteed issue - Must be accepted regardless of health
  • No pre-existing condition exclusions
  • Standard rates - Cannot be charged more for health conditions
  • Any plan available - Can choose any Medigap plan A through N

Guaranteed Issue Rights

Beyond open enrollment, New Jersey provides guaranteed issue rights in specific situations:

Triggering Events

EventGuaranteed Issue Right
Losing employer coverageCan purchase Medigap within 63 days
Leaving Medicare AdvantageCan return to Medigap within 63 days
Medicare Advantage plan leaves areaCan purchase Medigap
Medigap insurer becomes insolventCan switch to comparable plan
Losing MedicaidCan purchase Medigap

Trial Right

If you leave Medigap for Medicare Advantage:

  • Have 12 months to decide
  • Can return to previous Medigap plan
  • Or any plan from same insurer
  • Guaranteed issue, no health questions

Standardized Plans

New Jersey requires Medigap plans to be standardized:

Available Plans

PlanBenefits
Plan ABasic benefits only
Plan BBasic + Part A deductible
Plan CComprehensive (pre-2020 enrollees only)
Plan DSimilar to C, no Part B excess
Plan FMost comprehensive (pre-2020 enrollees only)
Plan GLike F without Part B deductible
Plan K50% cost sharing, out-of-pocket max
Plan L75% cost sharing, out-of-pocket max
Plan M50% Part A deductible
Plan NCost sharing, copays for visits

Note: Plans C and F are only available to those eligible for Medicare before January 1, 2020.

Rate Regulation

New Jersey has specific Medigap rate rules:

  • Attained age rating permitted (premiums increase with age)
  • Issue age rating also permitted
  • Community rating not required
  • Rate increases must be filed with DOBI
Test Your Knowledge

What is the New Jersey Birthday Rule for Medicare Supplement insurance?

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Test Your Knowledge

How long is the open enrollment period for Medicare Supplement in New Jersey?

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